diff --git a/.cirrus.yml b/.cirrus.yml
index 16e1a116..203ed889 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -96,16 +96,10 @@ linux_task_template: &LINUX_TASK_TEMPLATE
       
 tests_task:
   matrix:
-    # TODO: iris-grib does not currently work with iris-main, see Github issue
-    # #288 and #277.
-    #- name: "${CIRRUS_OS} tests: iris=repo-main python=3.8"
-    #  env:
-    #    PY_VER: 3.8
-    #    IRIS_SOURCE: "source"
-    - name: "${CIRRUS_OS} tests: iris=conda-release python=3.7"
+    - name: "${CIRRUS_OS} tests: iris=repo-main python=3.8"
       env:
-        PY_VER: 3.7
-        IRIS_SOURCE: "conda-forge"
+        PY_VER: 3.8
+        IRIS_SOURCE: "source"
     - name: "${CIRRUS_OS} tests: iris=conda-release python=3.8"
       env:
         PY_VER: 3.8
diff --git a/iris_grib/__init__.py b/iris_grib/__init__.py
index 09c0f4b8..20588385 100644
--- a/iris_grib/__init__.py
+++ b/iris_grib/__init__.py
@@ -618,8 +618,12 @@ def phenomenon_points(self, time_unit):
 
         """
         time_reference = '%s since epoch' % time_unit
-        return cf_units.date2num(self._phenomenonDateTime, time_reference,
-                                 cf_units.CALENDAR_GREGORIAN)
+        return float(
+            cf_units.date2num(
+                self._phenomenonDateTime, time_reference,
+                cf_units.CALENDAR_GREGORIAN
+            )
+        )
 
     def phenomenon_bounds(self, time_unit):
         """
@@ -630,8 +634,8 @@ def phenomenon_bounds(self, time_unit):
         # TODO #576 Investigate when it's valid to get phenomenon_bounds
         time_reference = '%s since epoch' % time_unit
         unit = cf_units.Unit(time_reference, cf_units.CALENDAR_GREGORIAN)
-        return [unit.date2num(self._periodStartDateTime),
-                unit.date2num(self._periodEndDateTime)]
+        return [float(unit.date2num(self._periodStartDateTime)),
+                float(unit.date2num(self._periodEndDateTime))]
 
 
 def _longitude_is_cyclic(points):
diff --git a/iris_grib/_load_convert.py b/iris_grib/_load_convert.py
index f987479c..7f54173a 100644
--- a/iris_grib/_load_convert.py
+++ b/iris_grib/_load_convert.py
@@ -292,7 +292,7 @@ def reference_time_coord(section):
     # Current GRIBAPI does not cover GRIB Section 1 - Octets 22-nn (optional)
     # which are part of GRIB spec v12.
     unit = Unit('hours since epoch', calendar=CALENDAR_GREGORIAN)
-    point = unit.date2num(dt)
+    point = float(unit.date2num(dt))
 
     # Reference Code Table 1.2.
     significanceOfReferenceTime = section['significanceOfReferenceTime']
@@ -1839,7 +1839,7 @@ def coord_timedelta(coord, value):
     # Calculate validity (phenomenon) time in forecast-reference-time units.
     frt_point = frt_coord.units.num2date(frt_coord.points[0])
     point_delta = coord_timedelta(fp_coord, fp_coord.points[0])
-    point = frt_coord.units.date2num(frt_point + point_delta)
+    point = float(frt_coord.units.date2num(frt_point + point_delta))
 
     # Calculate bounds (if any) in the same way.
     if fp_coord.bounds is None:
@@ -1847,7 +1847,7 @@ def coord_timedelta(coord, value):
     else:
         bounds_deltas = [coord_timedelta(fp_coord, bound_point)
                          for bound_point in fp_coord.bounds[0]]
-        bounds = [frt_coord.units.date2num(frt_point + delta)
+        bounds = [float(frt_coord.units.date2num(frt_point + delta))
                   for delta in bounds_deltas]
 
     # Create the time scalar coordinate.
diff --git a/iris_grib/_save_rules.py b/iris_grib/_save_rules.py
index 8b437587..32ad8716 100644
--- a/iris_grib/_save_rules.py
+++ b/iris_grib/_save_rules.py
@@ -15,6 +15,7 @@
 
 import cf_units
 import gribapi
+from gribapi import GRIB_MISSING_LONG
 import numpy as np
 import numpy.ma as ma
 
@@ -180,13 +181,16 @@ def shape_of_the_earth(cube, grib):
     # assume latlon
     cs = cube.coord(dimensions=[0]).coord_system
 
-    # Initially set shape_of_earth keys to missing (255 for byte, -1 for long).
+    # Initially set shape_of_earth keys to missing (255 for byte).
     gribapi.grib_set_long(grib, "scaleFactorOfRadiusOfSphericalEarth", 255)
-    gribapi.grib_set_long(grib, "scaledValueOfRadiusOfSphericalEarth", -1)
+    gribapi.grib_set_long(grib, "scaledValueOfRadiusOfSphericalEarth",
+                          GRIB_MISSING_LONG)
     gribapi.grib_set_long(grib, "scaleFactorOfEarthMajorAxis", 255)
-    gribapi.grib_set_long(grib, "scaledValueOfEarthMajorAxis", -1)
+    gribapi.grib_set_long(grib, "scaledValueOfEarthMajorAxis",
+                          GRIB_MISSING_LONG)
     gribapi.grib_set_long(grib, "scaleFactorOfEarthMinorAxis", 255)
-    gribapi.grib_set_long(grib, "scaledValueOfEarthMinorAxis", -1)
+    gribapi.grib_set_long(grib, "scaledValueOfEarthMinorAxis",
+                          GRIB_MISSING_LONG)
 
     if isinstance(cs, GeogCS):
         ellipsoid = cs
@@ -923,9 +927,10 @@ def set_fixed_surfaces(cube, grib, full3d_cube=None):
         gribapi.grib_set(grib, "scaleFactorOfFirstFixedSurface", 0)
         gribapi.grib_set(grib, "scaledValueOfFirstFixedSurface", 0)
         # Set secondary surface = 'missing'.
-        gribapi.grib_set(grib, "typeOfSecondFixedSurface", -1)
+        gribapi.grib_set(grib, "typeOfSecondFixedSurface", 255)
         gribapi.grib_set(grib, "scaleFactorOfSecondFixedSurface", 255)
-        gribapi.grib_set(grib, "scaledValueOfSecondFixedSurface", -1)
+        gribapi.grib_set(grib, "scaledValueOfSecondFixedSurface",
+                         GRIB_MISSING_LONG)
     elif not v_coord.has_bounds():
         # No second surface
         output_v = v_coord.units.convert(v_coord.points[0], output_unit)
@@ -936,9 +941,10 @@ def set_fixed_surfaces(cube, grib, full3d_cube=None):
         gribapi.grib_set(grib, "typeOfFirstFixedSurface", grib_v_code)
         gribapi.grib_set(grib, "scaleFactorOfFirstFixedSurface", 0)
         gribapi.grib_set(grib, "scaledValueOfFirstFixedSurface", output_v)
-        gribapi.grib_set(grib, "typeOfSecondFixedSurface", -1)
+        gribapi.grib_set(grib, "typeOfSecondFixedSurface", 255)
         gribapi.grib_set(grib, "scaleFactorOfSecondFixedSurface", 255)
-        gribapi.grib_set(grib, "scaledValueOfSecondFixedSurface", -1)
+        gribapi.grib_set(grib, "scaledValueOfSecondFixedSurface",
+                         GRIB_MISSING_LONG)
     else:
         # bounded : set lower+upper surfaces
         output_v = v_coord.units.convert(v_coord.bounds[0], output_unit)
diff --git a/iris_grib/tests/integration/format_interop/test_name_grib.py b/iris_grib/tests/integration/format_interop/test_name_grib.py
index 00ad9d85..15b82142 100644
--- a/iris_grib/tests/integration/format_interop/test_name_grib.py
+++ b/iris_grib/tests/integration/format_interop/test_name_grib.py
@@ -29,6 +29,7 @@ def name_cb(cube, field, filename):
     if z_coord:
         z_coord[0].standard_name = "height"
         z_coord[0].long_name = "height above ground level"
+        z_coord[0].attributes = {'positive': 'up'}
 
 
 class TestNameToGRIB(tests.IrisGribTest):
@@ -71,6 +72,11 @@ def test_name2_field(self):
                 warnings.warn(msg.format(i, name_cube.name()))
                 continue
 
+            # Iris>=3.2 loads in an extra 'z' coordinate which cannot currently
+            # be save to GRIB.
+            if name_cube.coords('z'):
+                name_cube.remove_coord('z')
+
             with self.temp_filename(".grib2") as temp_filename:
                 iris.save(name_cube, temp_filename)
                 grib_cube = iris.load_cube(temp_filename, callback=name_cb)
@@ -92,6 +98,11 @@ def test_name3_field(self):
         filepath = tests.get_data_path(("NAME", "NAMEIII_field.txt"))
         name_cubes = iris.load(filepath)
         for i, name_cube in enumerate(name_cubes):
+            # Iris>=3.2 loads in an extra 'z' coordinate which cannot currently
+            # be save to GRIB.
+            if name_cube.coord('z') is not None:
+                name_cube.remove_coord('z')
+
             with self.temp_filename(".grib2") as temp_filename:
                 iris.save(name_cube, temp_filename)
                 grib_cube = iris.load_cube(temp_filename, callback=name_cb)
diff --git a/iris_grib/tests/results/integration/name_grib/NAMEII/0_TRACER_AIR_CONCENTRATION.cml b/iris_grib/tests/results/integration/name_grib/NAMEII/0_TRACER_AIR_CONCENTRATION.cml
index b0daf509..1eb16eaf 100644
--- a/iris_grib/tests/results/integration/name_grib/NAMEII/0_TRACER_AIR_CONCENTRATION.cml
+++ b/iris_grib/tests/results/integration/name_grib/NAMEII/0_TRACER_AIR_CONCENTRATION.cml
@@ -9,7 +9,11 @@
         <dimCoord bounds="[[0.0, 3.0]]" id="1d45e087" points="[3.0]" shape="(1,)" standard_name="forecast_period" units="Unit('hours')" value_type="float64"/>
       </coord>
       <coord>
-        <dimCoord bounds="[[0.0, 100.0]]" id="c87e380b" long_name="height above ground level" points="[50.0]" shape="(1,)" standard_name="height" units="Unit('m')" value_type="float64"/>
+        <dimCoord bounds="[[0.0, 100.0]]" id="1a539915" long_name="height above ground level" points="[50.0]" shape="(1,)" standard_name="height" units="Unit('m')" value_type="float64">
+          <attributes>
+            <attribute name="positive" value="up"/>
+          </attributes>
+        </dimCoord>
       </coord>
       <coord datadims="[0]">
         <dimCoord id="77a50eb5" points="[52.367102, 52.368208, 52.369314, ..., 52.584984,
diff --git a/iris_grib/tests/results/integration/name_grib/NAMEII/1_TRACER_DOSAGE.cml b/iris_grib/tests/results/integration/name_grib/NAMEII/1_TRACER_DOSAGE.cml
index aef4988c..822e45db 100644
--- a/iris_grib/tests/results/integration/name_grib/NAMEII/1_TRACER_DOSAGE.cml
+++ b/iris_grib/tests/results/integration/name_grib/NAMEII/1_TRACER_DOSAGE.cml
@@ -9,7 +9,11 @@
         <dimCoord bounds="[[0.0, 3.0]]" id="1d45e087" points="[3.0]" shape="(1,)" standard_name="forecast_period" units="Unit('hours')" value_type="float64"/>
       </coord>
       <coord>
-        <dimCoord bounds="[[0.0, 100.0]]" id="c87e380b" long_name="height above ground level" points="[50.0]" shape="(1,)" standard_name="height" units="Unit('m')" value_type="float64"/>
+        <dimCoord bounds="[[0.0, 100.0]]" id="1a539915" long_name="height above ground level" points="[50.0]" shape="(1,)" standard_name="height" units="Unit('m')" value_type="float64">
+          <attributes>
+            <attribute name="positive" value="up"/>
+          </attributes>
+        </dimCoord>
       </coord>
       <coord datadims="[0]">
         <dimCoord id="77a50eb5" points="[52.367102, 52.368208, 52.369314, ..., 52.584984,
diff --git a/iris_grib/tests/unit/load_convert/test_grid_definition_template_10.py b/iris_grib/tests/unit/load_convert/test_grid_definition_template_10.py
index 1d835b7a..e2f6a53d 100644
--- a/iris_grib/tests/unit/load_convert/test_grid_definition_template_10.py
+++ b/iris_grib/tests/unit/load_convert/test_grid_definition_template_10.py
@@ -63,7 +63,8 @@ def expected(self, y_dim, x_dim):
                                  units='m',
                                  coord_system=cs)
         ny = 213
-        y_origin = 253793.10903714446
+        y_origin = 253793.10903714459
+
         dy = 12000
         y = iris.coords.DimCoord(np.arange(ny) * dy + y_origin,
                                  'projection_y_coordinate',
diff --git a/iris_grib/tests/unit/save_rules/test_set_fixed_surfaces.py b/iris_grib/tests/unit/save_rules/test_set_fixed_surfaces.py
index 545b19c0..862fd75d 100644
--- a/iris_grib/tests/unit/save_rules/test_set_fixed_surfaces.py
+++ b/iris_grib/tests/unit/save_rules/test_set_fixed_surfaces.py
@@ -15,6 +15,7 @@
 from unittest import mock
 
 import gribapi
+from gribapi import GRIB_MISSING_LONG
 import numpy as np
 
 import iris.cube
@@ -99,11 +100,11 @@ def test_altitude_point(self, mock_set):
         mock_set.assert_any_call(grib, "scaleFactorOfFirstFixedSurface", 0)
         mock_set.assert_any_call(grib, "scaledValueOfFirstFixedSurface",
                                  12345)
-        mock_set.assert_any_call(grib, "typeOfSecondFixedSurface", -1)
+        mock_set.assert_any_call(grib, "typeOfSecondFixedSurface", 255)
         mock_set.assert_any_call(grib, "scaleFactorOfSecondFixedSurface",
                                  255)
         mock_set.assert_any_call(grib, "scaledValueOfSecondFixedSurface",
-                                 -1)
+                                 GRIB_MISSING_LONG)
 
     @mock.patch.object(gribapi, "grib_set")
     def test_height_point(self, mock_set):
@@ -116,9 +117,10 @@ def test_height_point(self, mock_set):
         mock_set.assert_any_call(grib, "typeOfFirstFixedSurface", 103)
         mock_set.assert_any_call(grib, "scaleFactorOfFirstFixedSurface", 0)
         mock_set.assert_any_call(grib, "scaledValueOfFirstFixedSurface", 12345)
-        mock_set.assert_any_call(grib, "typeOfSecondFixedSurface", -1)
+        mock_set.assert_any_call(grib, "typeOfSecondFixedSurface", 255)
         mock_set.assert_any_call(grib, "scaleFactorOfSecondFixedSurface", 255)
-        mock_set.assert_any_call(grib, "scaledValueOfSecondFixedSurface", -1)
+        mock_set.assert_any_call(grib, "scaledValueOfSecondFixedSurface",
+                                 GRIB_MISSING_LONG)
 
     @mock.patch.object(gribapi, "grib_set")
     def test_no_vertical(self, mock_set):
@@ -128,9 +130,10 @@ def test_no_vertical(self, mock_set):
         mock_set.assert_any_call(grib, "typeOfFirstFixedSurface", 1)
         mock_set.assert_any_call(grib, "scaleFactorOfFirstFixedSurface", 0)
         mock_set.assert_any_call(grib, "scaledValueOfFirstFixedSurface", 0)
-        mock_set.assert_any_call(grib, "typeOfSecondFixedSurface", -1)
+        mock_set.assert_any_call(grib, "typeOfSecondFixedSurface", 255)
         mock_set.assert_any_call(grib, "scaleFactorOfSecondFixedSurface", 255)
-        mock_set.assert_any_call(grib, "scaledValueOfSecondFixedSurface", -1)
+        mock_set.assert_any_call(grib, "scaledValueOfSecondFixedSurface",
+                                 GRIB_MISSING_LONG)
 
 
 if __name__ == "__main__":
diff --git a/noxfile.py b/noxfile.py
index 4fac1195..a8ea6532 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -103,7 +103,7 @@ def _session_lockfile(session: nox.sessions.Session) -> Path:
 
     """
     lockfile_name = f"py{session.python.replace('.', '')}-linux-64.lock"
-    return Path("requirements/nox.lock") / lockfile_name
+    return Path("requirements/ci/nox.lock") / lockfile_name
 
 
 def _file_content(file_path: Path) -> str:
diff --git a/requirements/ci/iris-grib.yml b/requirements/ci/iris-grib.yml
index e9adb956..a76932b5 120000
--- a/requirements/ci/iris-grib.yml
+++ b/requirements/ci/iris-grib.yml
@@ -1 +1 @@
-py37.yml
\ No newline at end of file
+py38.yml
\ No newline at end of file
diff --git a/requirements/ci/nox.lock/py38-linux-64.lock b/requirements/ci/nox.lock/py38-linux-64.lock
new file mode 100644
index 00000000..2a0e1087
--- /dev/null
+++ b/requirements/ci/nox.lock/py38-linux-64.lock
@@ -0,0 +1,141 @@
+# Generated by conda-lock.
+# platform: linux-64
+# input_hash: 7035385083b1ee27d72762b3b315668678ee6f326c3e5a9e72c3d400163803b0
+@EXPLICIT
+https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2#d7c89558ba9fa0495403155b64376d81
+https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2021.10.8-ha878542_0.tar.bz2#575611b8a84f45960e87722eeb51fa26
+https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.36.1-hea4e1c9_2.tar.bz2#bd4f2e711b39af170e7ff15163fe87ee
+https://conda.anaconda.org/conda-forge/linux-64/libgfortran5-11.2.0-h5c6108e_13.tar.bz2#b62e87134ec17e1180cfcb3951624db4
+https://conda.anaconda.org/conda-forge/linux-64/libstdcxx-ng-11.2.0-he4da1e4_13.tar.bz2#573a74710fad22a27da784cc238150b9
+https://conda.anaconda.org/conda-forge/linux-64/libgfortran-ng-11.2.0-h69a702a_13.tar.bz2#a3a07a89af69d1eada078695b42e4961
+https://conda.anaconda.org/conda-forge/linux-64/libgomp-11.2.0-h1d223b6_13.tar.bz2#8e91f1f21417c9ab1265240ee4f9db1e
+https://conda.anaconda.org/conda-forge/linux-64/_openmp_mutex-4.5-1_gnu.tar.bz2#561e277319a41d4f24f5c05a9ef63c04
+https://conda.anaconda.org/conda-forge/linux-64/libgcc-ng-11.2.0-h1d223b6_13.tar.bz2#63eaf0f146cc80abd84743d48d667da4
+https://conda.anaconda.org/conda-forge/linux-64/bzip2-1.0.8-h7f98852_4.tar.bz2#a1fd65c7ccbf10880423d82bca54eb54
+https://conda.anaconda.org/conda-forge/linux-64/c-ares-1.18.1-h7f98852_0.tar.bz2#f26ef8098fab1f719c91eb760d63381a
+https://conda.anaconda.org/conda-forge/linux-64/expat-2.4.6-h27087fc_0.tar.bz2#90dec9e76bc164857cc200f81e981dab
+https://conda.anaconda.org/conda-forge/linux-64/geos-3.10.2-h9c3ff4c_0.tar.bz2#fe9a66a351bfa7a84c3108304c7bcba5
+https://conda.anaconda.org/conda-forge/linux-64/giflib-5.2.1-h36c2ea0_2.tar.bz2#626e68ae9cc5912d6adb79d318cf962d
+https://conda.anaconda.org/conda-forge/linux-64/jbig-2.1-h7f98852_2003.tar.bz2#1aa0cee79792fa97b7ff4545110b60bf
+https://conda.anaconda.org/conda-forge/linux-64/jpeg-9e-h7f98852_0.tar.bz2#5c214edc675a7fb7cbb34b1d854e5141
+https://conda.anaconda.org/conda-forge/linux-64/keyutils-1.6.1-h166bdaf_0.tar.bz2#30186d27e2c9fa62b45fb1476b7200e3
+https://conda.anaconda.org/conda-forge/linux-64/lerc-3.0-h9c3ff4c_0.tar.bz2#7fcefde484980d23f0ec24c11e314d2e
+https://conda.anaconda.org/conda-forge/linux-64/libaec-1.0.6-h9c3ff4c_0.tar.bz2#c77f5e4e418fa47d699d6afa54c5d444
+https://conda.anaconda.org/conda-forge/linux-64/libbrotlicommon-1.0.9-h7f98852_6.tar.bz2#b0f44f63f7d771d7670747a1dd5d5ac1
+https://conda.anaconda.org/conda-forge/linux-64/libdeflate-1.10-h7f98852_0.tar.bz2#ffa3a757a97e851293909b49f49f28fb
+https://conda.anaconda.org/conda-forge/linux-64/libev-4.33-h516909a_1.tar.bz2#6f8720dff19e17ce5d48cfe7f3d2f0a3
+https://conda.anaconda.org/conda-forge/linux-64/libffi-3.4.2-h7f98852_5.tar.bz2#d645c6d2ac96843a2bfaccd2d62b3ac3
+https://conda.anaconda.org/conda-forge/linux-64/libglu-9.0.0-he1b5a44_1001.tar.bz2#8208602aec4826053c116552369a394c
+https://conda.anaconda.org/conda-forge/linux-64/libmo_unpack-3.1.2-hf484d3e_1001.tar.bz2#95f32a6a5a666d33886ca5627239f03d
+https://conda.anaconda.org/conda-forge/linux-64/libnsl-2.0.0-h7f98852_0.tar.bz2#39b1328babf85c7c3a61636d9cd50206
+https://conda.anaconda.org/conda-forge/linux-64/libopenblas-0.3.18-pthreads_h8fe5266_0.tar.bz2#41532e4448c0cce086d6570f95e4e12e
+https://conda.anaconda.org/conda-forge/linux-64/libwebp-base-1.2.2-h7f98852_1.tar.bz2#46cf26ecc8775a0aab300ea1821aaa3c
+https://conda.anaconda.org/conda-forge/linux-64/libzlib-1.2.11-h36c2ea0_1013.tar.bz2#dcddf696ff5dfcab567100d691678e18
+https://conda.anaconda.org/conda-forge/linux-64/lz4-c-1.9.3-h9c3ff4c_1.tar.bz2#fbe97e8fa6f275d7c76a09e795adc3e6
+https://conda.anaconda.org/conda-forge/linux-64/ncurses-6.3-h9c3ff4c_0.tar.bz2#fb31bcb7af058244479ca635d20f0f4a
+https://conda.anaconda.org/conda-forge/linux-64/openssl-1.1.1l-h7f98852_0.tar.bz2#de7b38a1542dbe6f41653a8ae71adc53
+https://conda.anaconda.org/conda-forge/linux-64/pthread-stubs-0.4-h36c2ea0_1001.tar.bz2#22dad4df6e8630e8dff2428f6f6a7036
+https://conda.anaconda.org/conda-forge/linux-64/xorg-inputproto-2.3.2-h7f98852_1002.tar.bz2#bcd1b3396ec6960cbc1d2855a9e60b2b
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diff --git a/requirements/ci/py37.yml b/requirements/ci/py37.yml
deleted file mode 100644
index 68e0f80e..00000000
--- a/requirements/ci/py37.yml
+++ /dev/null
@@ -1,24 +0,0 @@
-name: iris-grib-dev
-
-channels:
-  - conda-forge
-
-dependencies:
-  - python=3.7
-
-# Setup dependencies.
-  - setuptools
-
-# Core dependencies.
-  - iris>=3.0.2
-  - python-eccodes
-
-# Optional dependencies.
-  - mo_pack
-
-# Test dependencies.
-  - mock
-  - filelock
-  - pep8
-  - requests
-  - nose
diff --git a/requirements/ci/py38.yml b/requirements/ci/py38.yml
index 3836de41..5fa58bb1 100644
--- a/requirements/ci/py38.yml
+++ b/requirements/ci/py38.yml
@@ -15,6 +15,7 @@ dependencies:
 
 # Optional dependencies.
   - mo_pack
+  - pip
 
 # Test dependencies.
   - mock
diff --git a/requirements/nox.lock/py37-linux-64.lock b/requirements/nox.lock/py37-linux-64.lock
deleted file mode 100644
index 21a9029d..00000000
--- a/requirements/nox.lock/py37-linux-64.lock
+++ /dev/null
@@ -1,127 +0,0 @@
-# platform: linux-64
-# env_hash: 79ed224559178fc9f6977fee4e2d80112f2bb8577c135e85152ef0a1f13ef003
-@EXPLICIT
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diff --git a/requirements/nox.lock/py38-linux-64.lock b/requirements/nox.lock/py38-linux-64.lock
deleted file mode 100644
index ceebcf28..00000000
--- a/requirements/nox.lock/py38-linux-64.lock
+++ /dev/null
@@ -1,125 +0,0 @@
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diff --git a/setup.py b/setup.py
index 492543e1..b2b0fba2 100644
--- a/setup.py
+++ b/setup.py
@@ -84,7 +84,6 @@ def file_walk_relative(top, remove=''):
     keywords         = ['iris', 'GRIB'],
     classifiers=[
         'Programming Language :: Python',
-        'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3 :: Only',
     ],